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(a) An indicator is a 'dye' that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein.
(b) The acid-base indicator extracted from lichen is Litmus.
(c) Turmeric paper turns red when put in an alkaline solution.
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Some examples of natural indicators are turmeric, grape juice, red cabbage, cherries, onion, beetroot etc. Synthetic indicators are indicators which are synthesized in the laboratory. Examples of synthetic indicators include phenolphthalein, methyl orange etc. litmus paper is also an example of synthetic indicator.
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